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Use of Special Purpose Entities and Variable Interest Entities - Classification and Carrying Value of Unconsolidated VIEs (Details) $ in Thousands | Jun. 30, 2018 USD ($) securitization | Dec. 31, 2017 USD ($) securitization
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Unconsolidated VIE, maximum loss exposure | $ 262,800 | $ 220,800
Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Total assets | 262,768 | 220,797
Variable Interest Entity, Not Primary Beneficiary | Investment securities, available for sale, at fair value, held in securitization trusts |  |
Variable Interest Entity [Line Items] |  |
Total assets | 50,134 | 47,922
Variable Interest Entity, Not Primary Beneficiary | Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets | 72 | 73
Variable Interest Entity, Not Primary Beneficiary | Preferred equity and mezzanine loan investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 176,741 | 138,920
Variable Interest Entity, Not Primary Beneficiary | Investment in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | 35,821 | 33,882
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS |  |
Variable Interest Entity [Line Items] |  |
Total assets | 50,206 | 47,995
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Investment securities, available for sale, at fair value, held in securitization trusts |  |
Variable Interest Entity [Line Items] |  |
Total assets | 50,134 | 47,922
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets | 72 | 73
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Preferred equity and mezzanine loan investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Investment in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investments in multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Total assets | 178,629 | 140,329
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investments in multi-family properties | Investment securities, available for sale, at fair value, held in securitization trusts |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investments in multi-family properties | Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investments in multi-family properties | Preferred equity and mezzanine loan investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 170,110 | 132,009
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investments in multi-family properties | Investment in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | 8,519 | 8,320
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loan on multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Total assets | 6,631 | 6,911
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loan on multi-family properties | Investment securities, available for sale, at fair value, held in securitization trusts |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loan on multi-family properties | Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loan on multi-family properties | Preferred equity and mezzanine loan investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 6,631 | 6,911
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loan on multi-family properties | Investment in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Equity investments in entities that invest in multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Total assets | 27,302 | 25,562
Variable Interest Entity, Not Primary Beneficiary | Equity investments in entities that invest in multi-family properties | Investment securities, available for sale, at fair value, held in securitization trusts |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Equity investments in entities that invest in multi-family properties | Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Equity investments in entities that invest in multi-family properties | Preferred equity and mezzanine loan investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Equity investments in entities that invest in multi-family properties | Investment in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | $ 27,302 | $ 25,562
K-Series | Multi-family collateralized mortgage backed securities |  |
Variable Interest Entity [Line Items] |  |
Number of securitizations | securitization | 2 | 2

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- Definition The item represents the maximum loss exposure on unconsolidated variable interest entities. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5728-111685 + Details
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